JonBenet Ramsey is one of the popular cold cases in America. 20 years later, a group of detectives has decided to re-investigate the case in a special docu-series, "The Case of JonBenet Ramsey," to be aired on CBS.

It has been 20 years has passed since the death of the young beauty queen, JonBenet Ramsey. Until today, it is still a mystery who is the killer or maybe a group of killers of Ramsey.

This week, a new docu-series with the aim to solve the cold case, teases on its trailer the possible theories and the murder weapons, which were reported used in the crime scene. "The Case of JonBenet Ramsey" trailer has been released this week.

In December 1996, the young beauty queen was found strangled to death in her home in Boulder, Colorado, eight hours after a ransom note found in her family home. In the trailer, it mentioned that "there are not charges" were filed in the murder.

The team created a full scale replica of the Ramsey's home, so they could study and analyze the case, and seek for new theories about who's responsible for the crime of the six-year-old beauty queen.

Her mom, Patsy Ramsey and dad, John Bennett were accused of killing their daughter. But due to lack of evidences, the couple was acquitted, SMH reported.

Meanwhile, TV personality and psychologist , Dr. Phillip Calvin "Phil" McGraw or Dr. Phil sat down with JonBenet's brother, Burke Ramsey, who Dr. Phil called "missing link" in a murder case. The 65-year-old host said the viewers will surely be hooked up by Burker's interview.

"I think people are going to be very interested. His personality is very unique. I think they are going to find him compelling. It's going to be very difficult to look away from," McGraw said.

Burke was only 9-year-old when his sister killed. McGraw's interview with Burke, which will be aired on "Dr.Phil," will come in three installments. The first installment will be aired on Sept. 12 on CBS, Fox News reported, while airdate of "The Case of JonBenet Ramsey," which will be aired also on CBS, is set for Sept. 18.

In the next episode of "Dr. Phil," will Burke reveal the killer of his sister? Is their untold story that would help solve the case? In docu-series of a group of detective, will they find the answer and solve the case?

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